<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
	</head>
	<body>
		<div id="app">
			<input type="text" v-model="num1"/>
			<select v-model="op">
				<option>+</option>
				<option>-</option>
				<option>*</option>
				<option>/</option>
			</select>
			<input type="text" v-model="num2"/>
			<button v-on:click="getNum">=</button>
			<input type="text" v-model="result"/>
		</div>
		
		<script>			
			var app = Vue.createApp({
				data(){
					return {
						num1:'',
						num2:'',
						result:'',
						op:'+'
					}
				},
				methods:{
					getNum:function(){
						if(this.op == "+"){
							this.result = parseFloat(this.num1) + parseFloat(this.num2)
						}else if(this.op == "-"){
							this.result = parseFloat(this.num1) - parseFloat(this.num2)
						}else if(this.op == "*"){
							this.result = parseFloat(this.num1) * parseFloat(this.num2)
						}else if(this.op == "/"){
							this.result = parseFloat(this.num1) / parseFloat(this.num2)
						}
					}
				}
			}).mount("#app")
		</script>
	</body>
</html>
